| Current (2) |
| Chairman | 2020 |
| Board of Directors | 2021 |
| Former (15) |
| Board of Directors | 1998 – 1998 |
| Chairman | 2000 – 2008 |
| Board of Directors | 2000 – 2008 |
| Chairman | 1999 – 2000 |
| Board of Directors | 2015 – 2021 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 2006 – 2014 |
| Chairman | 2015 – 2020 |
| Board of Directors | 2005 – 2006 |
| Chairman | 1998 – 1998 |
| Board of Directors | 2014 – 2015 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 1999 – 2000 |
| Chairman | 2013 – 2015 |
| Chairman | 2008 – 2013 |